Jar



Feb. 11, 1930. w HURCH ET AL 1,747,020

' JAR Filed April 18, 1927 attozueq Patented Feb. 11, 1930 UNITED STATES PATENT OFFICE WALTER L. CHURCH AND WILLIAM L. PEARCE, OF HOUSTON, TEXAS JAR Application filed April 18,

This invention relates to new and useful improvements in a jar.

One object of the invention is to provide an implement of the character described special 1y designed to be connected to a pipe stuck in a well bore and through which the stuck pipe may be vibrated and thereby loosened preparatory to its withdrawal.

Another object of the invention is to provide an implement of the character described which includes a pipe grappling member and an operating stem, or string of pipe, and interconnecting means through which the rebound of the string, after the same has been subjected to tension, is utilized to impart a vibration, or jar to the stuck pipe.

1V ith the above and other objects in view this invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 shows a vertical sectional View of the upper end of the jar.

Figure 2 shows a vertical sectional view of the lower end .thereof.

Figure 3 shows a transverse sectional view thereof, taken on the line 3-3 of Figure l, and

Figure 4 shows a transverse sectional view taken on the line H of Figure 1.

Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1 designates a string of pipe of the required length and to the lower end of which the tubular housing 2 is connected.

The numeral 3 designates a conventional grappling tool, adapted to be connected to the stuck pipe 4. An upstanding stem 5 is connected to this grappling tool through the coupling 6. This stem fits snugly through a gland 7 which is threaded into the lower end of the housing 2. The housing 2 is contracted inwardly beneath the lower end of the string 1 forming an internal annular shoulder 8 and spaced beneath said shoulder the housing has the opposing vertical ril S),

1927. Serial No. 184,633.

9, with the intervening vertical grooves 10, 10, between them, the lower ends of said ribs and grooves terminating at the upper end of the gland 7. Between the upper ends of the ribs 9 and the shoulder 8 there is a cavity 11 in the housing, circular in cross-sectional contour.

The upper end of the stem 5 has external vertical ribs and grooves 12, 12 and 13, 13, similar in form and arrangement to the corresponding ribs and grooves 9 and 10 of said housing and the. stem 5 is of sufficient length to give the housing 2 the necessary range of movement thereon as and for the purposes hereinafter explained.

The upper end of the collar 6 has the oppositely dispose-d upstanding lugs 1 1, 14, and the lower end of the gland 7 is formed with notches 15, 15, adapted to receive said lugs.

The notches 15 are disposed between, or in staggered relation to, the grooves 10 of said housing.

In use the implement is let down into a well bore until the grappling tool 3, (in this instance a tapered tap) enters the pipe. While being so lowered the ribs 12 may be disposed in the grooves 10, with their lower ends hanging on the upper end of the gland 7. The housing and stem will thus be locked against independent rotation.

The operating string 1 may now be suitably turned to cause the grappling tool 3 to engage the stuck pipe 4, or if it be desired before rotating the string 1 it may be lowered until the bushing 7 rests on the upper end of the coupling 5 and then slightly turned until the notches 15 register with, and receive the lugs 14 and the string 1 then rotated to cause the grapple 3 to engage with the stuck pipe. 11' hen the stuck pipe is securely engaged and the notches 15 in position to receive said lugs lithe upper end of the stem will extend up into the chamber 11 with the lower ends of the ribs 12 of the stem clearing the upper end of the ribs 9 ofthe housing, said ribs 9 being in alignment under the ribs 12 so as to engage therewith, as indicated in dotted lines in Figure 1. An upward pull is now exerted through the stem 1. This upward pull is exerted through the instrumentalit of a cable threaded through the crown block of a derrick and connected to the upper end of the strin 1 and operable through the instrumentahty of the usual draw works. This apparatus for handling the string 1 has not been shown or described for the reason that it is in common use and well known to those familiar with the art of well drilling. A long string of pipe, such as will be used in an apparatus of the character described has considerable elasticity and when it is placed under tension, as described, it should then be rotated by the conventional rotary drilling machine, forming a part of the rig, and of well known construction, to carry the ribs 9 around out of alignment with the ribs 12 and into alignment with the grooves 10. The rebound of the string 1 will then cause a sudden upward movement of the housing 2 and the upper end of the gland 7 will strike against the lower ends of the ribs 12 with a hammer-like blow imparting a sudden upward pull to the stuck pipe 4. The string 1 is then lowered until the lower end of the gland rests upon the upper end of the coupling 6 and given a quarter turn to align the notches 15 with the lugs 14. The housing will then drop on down with the lugs 14 projecting up into the notches 15. This Will insure the alignment of the ribs 9 directly underneath the ribs 12. Another upward pull is exerted to place the string 1 again under tension and said string and housing are then given a quarter turn to carry the ribs 9 out of alignment with the ribs 12 and into alignment with the rooves 10 and the rebound of the string 1 W111 result, as above explained,

imparting another vibration and upward pull to the stuck pipe 4 and the process may be repeated until the stuck pipe is released so that it may be withdrawn.

What we claim is 1. A jar including two telescoping parts, each formed with vertical ribs, and intervening vertical grooves, one of said parts having a cavity beyond its ribs, at one end, and abutments opposite its grooves, at the other end, said parts being also provided, one with notches and the other with lugs adapted to engage in said notches when the ribs of one part align with the ribs of the other part.

2. A jar including two telescoping parts, one part having a cavity and an abutment spaced from said cavity, and also having internal vertical ribs and intervening vertical grooves, between said cavity and abutment, external vertical ribs carried by the other part movable between the ribs of said first mentioned part, into said cavity; said parts being relatively rotatable, when in said last mentioned relation.

3. jar including a female member and a male member telescopically arranged, said female member having a cavity, an abutment carried by the female member and spaced ing a hammer,

from said cavity and forming a hammer, vertical abutments on the male member forming in effect anvils, inside ribs carried by the female member said female member having longitudinal grooves spacing said ribs apart, said abutments of the male member being adapted to move through said grooves into said cavity when said members are moved longitudinally in one direction, said members being relatively rotatable, when said ribs are in said cavity to permit said anvils to align with said ribs, said members being provided, one with notches and the other with lugs forming opposing interlocking means disposed to be intermeshed, when said members are in said last mentioned position, by the relative longitudinal movement of said members.

4. A jar including a housing, a stem working in said housing, said housing having an internal cavity, an abutment in the housing spaced from said cavity and forming a hammer, a lateral projection carried by the stem and forming an anvil, an inside projection carried by the housing, said stem and housing being vertically movable, relative to each other, into one position to carry said anvil into said cavity, and being relatively rotatable into a position to carry said anvil into alignment with said housing projection, said hous ing and stem being also provided one with notches and the other with lugs forming means adapted to intermesh and which are carried into intermeshing relation by such relative rotation of said housing and stem.

5. A jar including a housing having an internal projection and also having an internal abutment spaced from said projection forming a hammer, a stem telescoping into said housing, and having an external projection forming an anvil, said stem being longitudinally movable relative to the housing, into one position, to interlock said projections to prevent the relative rotation of the housing and stem, said hammer confronting said anvil when in said position, said housing and stem being movable into another position to permit such relative rotation whereby the anvil may be carried into alignment with said housing projection and other means carried by the housing and stem respectively, adapted to be moved into intermeshin relation to prevent relative rotation of the housing and stem.

6. A jar including a housing having an internal projection and also havin an internal abutment spaced from said projection form a stem telescoping into said housing, and having an external projection forming an anvil, said stem being longitudinally movable relative to the housing into one position to interlock said projection to prevent the relative rotation of the housing and stem, said hammer confronting said anvil when in said position, said housing and stem being movable into another position to per mit such relative rotation whereby the anvil may be carried into alignment with said housing and projection, other means carried by the stem and housing and adapted to interlock, when said housing and stem are in such last named relative position.

7. A jar including a housing having an internal projection and also having an internal abutment spaced from said pro ection forming a hammer, a stem telescoping into said housing, and having an external projection forming an anvil, said stem being longitudinally movable relative to the housing into one position to interlock said projections to prevent relative rotation of the housing and stem, said hammer confrontin said anvil when in said position, said housmg and stem being movable into another position to permit such relative rotation whereby the anvil may be carried into alignment with said housing projection, said anvil and housing abutment, when in alignment, being disposed to permit a limited longitudinal movement of the housing and stem said housing and stem being provided, one with notches and the other with lugs adapted to engage in said notches and forming interlocking means to insure the alignment of said anvil with said housing projection.

In testimony whereof we have signed our names to this specification.

WALTER L. CHURCH. WILLIAM L. PEARCE. 

